Replace “YOUR_PHTML_FILE” with the path to your phtml file from the app/design/frontend/YOUR_PACKAGE/YOUR_THEME/template directory.
For example, let’s say you have your phtml file named “test.phtml” in the template/page/html directory, you would replace “YOUR_PHTML_FILE” with “page/html/test.phtml”
Once that is done, add the following code to your phtml file: